[bug #54233] Infinite loop w/ -j2 & multiple pattern rules

[Aleksey Victor Trevelin Covacevi]

Follow-up Comment #1, bug #54233 (project make):

The use case here is the following:

* %.lnk/%.elf: the recipe links an .elf and touches a tag file (.lnk);
* %.dbg/%.elf: the recipe produces a .dbg file, updating (touching) an .elf in
the process; the rule must depend only on %.lnk or it will be triggered
unnecessarily in the next build.

%.elf is mentioned as a target in both rules because it is updated (touched)
by both rules. (.DELETE_ON_ERROR will delete .elf files when either rule
fails, which is correct.)

A workaround is not using .ONESHELL nor single-line recipes; or refrain from
mentioning %.elf as a prerequisite (and instead mentioning %.lnk).

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